Creep Amendments in the European Standard EN 13445

Abstract

This paper describes the Creep Amendments which will be implemented in EN 13445, the European Standard for Unfired Pressure Vessels, in 2007. It will address four topics: 1) Specifications for Materials and Weldments. 2) Specifications for Design By Formula and Damage Accumulation rules. 3) Specifications for Design By Analysis — Direct Route (Creep Rupture, Excessive Creep Strain, Creep and cyclic Fatigue Interaction). 4) Specifications for Inspection and Non-Destructive Testing (NDT).

Evaluation of Limit Load Analysis Methods Applied to High Temperature Design: Part 2 — Analysis and Results

“…In isolation, the simplest available elevated temperature LLA method is that provided in BS EN 13445-3:2009 [6]. The full treatment of the BS EN 13445 DBA procedure is beyond the scope of this paper, and the reader is referred to [9] or many other excellent documents for this purpose. However, as described in B.9.4.1 (Creep Rupture Principle), traditional low temperature LLA is applied with specified design factors (125% of operating pressure, assuming in-service inspection, which comes from 1.2(12.5/12)) and the design may be considered satisfactory for avoidance of creep rupture "with the maximum absolute value of the principal structural strains being less than 5 %."…”

“…With an emphasis on primary loading, the 2009 Edition and later of the EN 13445 code [6] is of particular interest because it offers specific design rules for use with numerical analysis [9]. In lieu of a detailed material model, design methods such as [6] still seek to exploit the benefits of numerical analysis while trying to remain consistent with the design allowables and margins of existing codes.…”

Optimum Design of Polymer Composite Reactor Pressure Vessels

“…Problems include traditional areas such as structural analysis, heat transfer, fluid flow, mass transfer, and electromagnetic potential. The simple equations that model finite elements are combined into a broader system of equations to model the entire problem [6]. FEM then approximates…”

Optimal sensor positioning on pressurized equipment based on Value of Information

“…In the context of SSCs creep, for example, market competition has pushed industry to operate the SSCs at high design stresses (and, in some cases, beyond design stresses), 8,9 while new knowledge on creep phenomenon becomes available. This has recently resulted in a deep revision of the guidelines, 10,11 making scheduled inspections by Non-Destructive Tests (NDTs) recommended to prevent SSCs creep and failures. 1,[12][13][14] On the other hand, condition monitoring and intelligent analysis of data collected by sensors may help predicting degradation escalation and anticipating the risk of failure.…”